Abstract

The Mg–Al–Ca system is experimentally investigated at 400 °C using diffusion couples and key experiments. Phase relations and solubility limits were determined for binary and ternary phases using EPMA and XRD techniques. The Mg 2Ca, (Al,Mg) 2Ca phases were found to form substitutional solid solutions where Al substitutes Mg atoms. The Al 2(Mg,Ca) and Al 140Mg 89 phases form solid solutions where Ca substitutes Mg atoms. The Al 2Ca phase has a complex solid solution where Mg substitutes both Al and Ca atoms. No ternary solubility was found for the Al 4Ca phase. Based on the results of the phase analysis and experimental literature data, the isothermal section of the Mg–Al–Ca phase diagram at 400 °C has been constructed.

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